> How I can take a 5 digit zipcode and add on the +4 part? I hear it is faster
> to ship with the USPS when you have a properly formatted 9 digit zipcode.
>
> Anyone hear the same thing? Thanks!

You can't just "look up" the other 4 digits, unless you know the entire address. If you know the entire Address, you can use this web site to look up the +4 digits:http://www.usps.com/zip4/welcome.htm

But that won't help you very much if you have a bunch of addressed. Forunately, the USPS has a web service that you can hook into to do the lookups for you. Here is a link with more information:http://www.usps.com/webtools/address.htm

That site will also help you correct addressing errors and things like that, so if shipping speed is really important, then that will help out too.

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